Reference for Niddah 73:6

בעי רבא

causes the uncleanness of <i>zibah</i> that renders all the previous counting void, and this, therefore, [does not do it, since] it is no cause of such uncleanness? — Abaye replied: A <i>zibah</i> that is due to an accident provides the answer,<span class="x" onmousemove="('comment',' Lit., proves'. ');">⁵</span>

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